METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS

A DPC ( 200 ) that includes: a frequency source ( 20 ); a delay-locked loop ( 220 ) for receiving a clock signal and generating a plurality of phase-shifted clock signals; a control device ( 280 ) having a DPS ( 282 ) and a DAC ( 284 ) for receiving an input signal identifying a desired frequency fo...

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Bibliographische Detailangaben
Hauptverfasser:	CHARASKA, JOSEPH, A, GAILUS, PAUL, H, GABATO, MANUEL, P., JR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:	A DPC ( 200 ) that includes: a frequency source ( 20 ); a delay-locked loop ( 220 ) for receiving a clock signal and generating a plurality of phase-shifted clock signals; a control device ( 280 ) having a DPS ( 282 ) and a DAC ( 284 ) for receiving an input signal identifying a desired frequency for a synthesized signal; a selection circuit ( 270 ) for receiving the plurality of phase-shifted clock signals, selecting a sequence of the phase-shifted clock signals and outputting a coarse synthesized signal; a variable delay cell ( 290 ) having a first input coupled to the selection circuit to receive the coarse synthesized signal and a second input coupled to the control device for receiving a fine tune adjustment signal to modify the coarse synthesized signal to generate the synthesized signal ( 292 ) having substantially the desired frequency. The DPC further includes training apparatus for calibrating the DPC.